CN117277045A - Method and device for realizing quick locking of different gains of EDFA (enhanced data packet radio) - Google Patents
Method and device for realizing quick locking of different gains of EDFA (enhanced data packet radio) Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- H01S3/1109—Active mode locking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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Abstract
The invention relates to the technical field of optical fiber amplification, in particular to a method and a device for realizing quick locking of different gains of an EDFA, which comprises the following steps: performing linear fitting on the gain factors corresponding to the maximum gain and the minimum gain in the preset gain range and the calibration values of the ASE factors to obtain the gain factors and the ASE factors corresponding to the gains in the preset gain range; in a preset gain range, calibrating the input light to obtain the relation between the sampling ADC value of the input light corresponding to each gain in the preset gain range and the reporting power; determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power; and obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and regulating the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
Description
Technical Field
The invention relates to the technical field of optical fiber amplification, in particular to a method and a device for realizing quick locking of different gains of an EDFA.
Background
With the development of optical fiber amplification technology, more and more companies tend to reduce resource investment as much as possible in the product development process, so as to achieve the purpose of designing an Erbium-doped optical fiber amplifier (Erbium-doped Optical Fiber Amplifier, abbreviated as EDFA) with low input and different target gains, compared with the traditional optical fiber amplification technology, the internal single design of a proportional-integral-derivative (Proportion Integration Diffe, abbreviated as PID) circuit can only realize quick locking of a certain fixed gain point, other gain points are further and further away from a calibration gain point, once the gain is changed, the sampling of an Analog-to-Digital Converter (Analog-to-Digital Converter, abbreviated as ADC) of the power of an input photodetector (Photoelectric Detector, abbreviated as PD) is also affected, the reporting precision of the input PD of the EDFA is worse, and further the gain precision is worse, and the requirement of the actual EDFA cannot be met.
On the other hand, for non-scaling gain points, the conventional gain locking method generally realizes gain locking of each gain point by a software advanced process control (Advanced Process Control, abbreviated as APC), that is, the micro control unit (Microcontroller Unit, abbreviated as MCU) uses the input PD, the target gain, and the result of the sum of corresponding ASE scaling and fitting values, that is, the result is fed back to the PID by the target output power, and further, the actually required pump analog-to-digital converter (Digital to Analog Convertor, abbreviated as DAC) value is calculated by the MCU, and then fed back to the pump DAC driving circuit, and the pump DAC value required for reaching the target gain point is obtained by the approach adjustment method.
In view of this, overcoming the drawbacks of the prior art is a problem to be solved in the art.
Disclosure of Invention
The invention aims to solve the technical problems that: how to realize quick locking of the gain of the EDFA under the conditions of improving the accuracy of reporting the power of the input PD of the EDFA and reducing the development cost.
The invention adopts the following technical scheme:
a first aspect provides a method of implementing fast locking of different gains of an EDFA, comprising:
performing linear fitting on the calibration values of the gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the gain factors corresponding to the gains in the preset gain range;
performing linear fitting on the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain ASE factors corresponding to the gains in the preset gain range;
in the preset gain range, scaling the input light to obtain the relation between the sampling ADC value and the reporting power of the input light corresponding to each gain in the preset gain range;
determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power;
And obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
Preferably, the linearly fitting the scaled values of the gain factors corresponding to the maximum gain and the minimum gain in the preset gain range to obtain the gain factors corresponding to the gains in the preset gain range includes:
calibrating the gain factors of the maximum gain and the minimum gain respectively to obtain calibrated values of the gain factors of the maximum gain and the minimum gain;
and performing linear fitting on the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the gain factor corresponding to the maximum gain and the gain factor corresponding to the minimum gain to obtain a gain factor relation, so as to obtain the gain factors corresponding to the gains in the preset gain range according to the gain factor relation.
Preferably, the scaling the gain factors of the maximum gain and the minimum gain to obtain scaled values of the gain factors of the maximum gain and the minimum gain includes:
Obtaining the highest output light power corresponding to the preset gain range;
determining an input optical power PH corresponding to the maximum gain according to the highest output optical power and the maximum gain;
driving an amplifier with the input optical power PH, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibrated value of the gain factor of the maximum gain;
determining the input optical power PL corresponding to the minimum gain according to the highest output optical power and the minimum gain;
and driving an amplifier with the input optical power PL, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain so as to obtain the scaled value of the gain factor of the maximum gain.
Preferably, the linearly fitting the calibration values of the ASE factors corresponding to the maximum gain and the minimum gain in the preset gain range, to obtain the ASE factors corresponding to the gains in the preset gain range includes:
calibrating ASE factors of the maximum gain and the minimum gain respectively to obtain calibration values of the ASE factors of the maximum gain and the minimum gain;
And linearly fitting the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the ASE factor corresponding to the maximum gain and the ASE factor corresponding to the minimum gain to obtain an ASE factor relational expression, so as to obtain the ASE factors corresponding to the gains according to the ASE factor relational expression.
Preferably, the calibrating the ASE factors of the maximum gain and the minimum gain respectively, to obtain the calibrated values of the ASE factors of the maximum gain and the minimum gain includes:
acquiring the minimum output light power corresponding to the preset gain range;
determining an input optical power PH' corresponding to the maximum gain according to the minimum output optical power and the maximum gain;
driving an amplifier with the input optical power PH', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibration value of the ASE factor of the maximum gain;
determining the input optical power PL' corresponding to the minimum gain according to the minimum output optical power and the minimum gain;
and driving an amplifier with the input optical power PL', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain, so as to obtain the scaling value of the ASE factor of the maximum gain.
Preferably, the scaling the input light in the preset gain range to obtain the relationship between the sampled ADC value of the input light corresponding to each gain in the preset gain range and the reported power includes:
presetting an input optical power range, and dividing the input optical power range into a first optical power range and a second optical power range according to the optical power;
taking the maximum gain, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a first relation between the reported power and the sampling ADC value: reporting power=k1_h x+b1_h_, wherein X is a sampling ADC value, k1_h_ and b1_h are constants;
taking the maximum gain, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a second relation between the reported power and the sampling ADC value: reporting power=k1_l x+b1_l, where X is the sampling ADC value and k1_l and b1_l are constants;
Taking the minimum gain, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a third relation between the reported power and the sampling ADC value: reporting power=k2_h x+b2_h_, wherein X is a sampling ADC value, k2_h_ and b2_h are constants;
taking the minimum gain, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a fourth relation between the reported power and the sampling ADC value: reporting power=k2_l x+b2_l, where X is the sampling ADC value and k2_l and b2_l are constants;
and obtaining the relation between the sampling ADC value and the reporting power according to the first relation, the second relation, the third relation and the fourth relation.
Preferably, the obtaining the relationship between the sampled ADC value and the reported power according to the first relationship, the second relationship, the third relationship, and the fourth relationship includes:
performing linear fitting on the K1_h and the K2_h with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking the K2_h as an ordinate as a first fitting point, taking the maximum gain as an abscissa, taking the K1_h as an ordinate as a second fitting point, and performing linear fitting on the first fitting point and the second fitting point to obtain a slope factor K_h_factor;
Performing linear fitting on K1_l and K2_l with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking K2_l as an ordinate as a third fitting point, taking the maximum gain as an abscissa, taking K1_l as an ordinate as a fourth fitting point, and performing linear fitting on the third fitting point and the fourth fitting point to obtain a slope factor K_l_factor;
linearly fitting B1_h and B2_h with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely linearly fitting the fifth fitting point and the sixth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_h as an ordinate as a fifth fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_h as an ordinate as a sixth fitting point, and obtaining an offset factor B_h_offset;
performing linear fitting on the B1_l and the B2_l with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely performing linear fitting on the seventh fitting point and the eighth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_l as an ordinate as a seventh fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_l as an ordinate, and obtaining an offset factor B_l_offset;
The method comprises the following steps of: reporting power=k_h_factor+adc+b_h_factor, reporting power=k_l_factor+adc_l_factor, reporting power=k_h_offset+adc_h_offset, reporting power=k_l_offset+adc+b_l_offset, where k_h_factor, b_h_factor, k_l_factor, b_l_factor, k_h_offset, b_h_offset, k_l_offset, and b_l_offset are constants, so as to obtain a relationship between the sampled ADC value of the input light corresponding to each gain in the preset gain range and the reporting power.
Preferably, the amplifier comprises a digital potentiometer and a PID control circuit;
the determining the target gain, obtaining a target gain factor, a target ASE factor and a target reporting power corresponding to the target gain, and obtaining a target input optical power according to the target gain factor, the target ASE factor and the target reporting power, including:
for any target gain in the preset gain range, the PID control circuit respectively acquires a target gain factor, a target ASE factor and target reporting power corresponding to the target gain;
controlling the resistance value of the digital potentiometer through the target gain factor;
and adding the power of the target ASE factor and the target reporting power to obtain the target input optical power.
Preferably, the pump DAC value required by the target gain is obtained according to the monitored output optical power and the target input optical power, and the driving current of the pump unit is adjusted by the pump DAC value, so as to realize locking of the target gain, which specifically includes:
taking the target input optical power as a first input of the PID control circuit;
taking the output optical power as a second input of the PID control circuit;
the PID control circuit obtains a control error signal according to the difference value of the first input and the second input;
the control error signal is used as the input of the pumping DAC, the driving current of the pumping unit is controlled through the digital potentiometer to obtain the pumping DAC value required under the target gain, and the pumping unit is directly driven by the control error signal as the driving current to regulate the current so as to lock the target gain.
In a second aspect, an apparatus for implementing fast locking of different gains of an EDFA is provided, including: the device comprises a gain factor fitting module, an ASE factor fitting module, an input light scaling module, an obtaining module and a locking module;
the gain factor fitting module is used for linearly fitting the calibration values of the gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the gain factors corresponding to the gains in the preset gain range;
The ASE factor fitting module is used for linearly fitting the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain ASE factors corresponding to the gains in the preset gain range;
the input light scaling module is used for scaling input light in the preset gain range to obtain the relation between the sampling ADC value of the input light corresponding to each gain in the preset gain range and the reporting power;
the acquisition module is used for determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power;
the locking module is used for obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
Compared with the prior art, the invention has the beneficial effects that:
the invention obtains the gain factors, ASE factors and reported power corresponding to all gain points in a preset gain range by respectively carrying out linear fitting on the gain factors, ASE factors and the calibrated values of the reported power of the maximum gain point and the minimum gain point in the preset gain range in advance, obtains the target gain factors, the target ASE factors and the target reported power corresponding to the target gain after confirming the target gain, obtains the target input optical power according to the target gain factors, the target ASE factors and the target reported power, obtains the pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusts the driving current of a pumping unit through the pumping DAC value so as to realize the locking of the target gain; the accuracy of reporting power of the EDFA is improved on the basis of not improving development cost, and the gain of the EDFA is rapidly locked.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of an EDFA according to an embodiment of the present invention, where the method is for implementing fast locking of different gains of the EDFA;
fig. 2 is a schematic structural diagram of a hardware control unit for implementing a method for fast locking different gains of an EDFA according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method for implementing fast locking of different gains of an EDFA according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of scaling gain factors for implementing a method for fast locking different gains of an EDFA according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of ASE factor scaling for implementing a method for fast locking different gains of an EDFA according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of PID control for implementing a method for fast locking different gains of an EDFA according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a device for implementing fast locking of different gains of an EDFA according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The terms "first," "second," and the like herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Example 1
In order to solve the problems in the prior art, in this embodiment, a method for implementing fast locking of different gains of an EDFA is provided, where an optical network architecture implementing the method includes one or more EDFA amplifiers, as shown in fig. 1, where each EDFA amplifier includes: the optical fiber comprises an input light PD, an optical isolator 1, a wavelength division multiplexer 1, 980 pump lasers, an erbium-doped optical fiber, an output light PD, an optical isolator 2 and a hardware control unit, wherein the input end of the optical isolator 1 is used as an input port of the EDFA amplifier, the output end of the optical isolator 1 is connected with the input end of the wavelength division multiplexer 1, the pump end of the wavelength division multiplexer is connected with the 980 pump lasers, the output end of the wavelength division multiplexer 1 is connected with the input end of the optical isolator 2, the output end of the optical isolator 2 is connected with the input end of the output light PD, and the output end of the output light PD is used for outputting amplified signal light, and the hardware control unit is shown in fig. 2 and comprises: the specific connection relationship and implementation principle of the PID control circuit, 980 pump driving circuit, input PD detection circuit, output PD detection circuit and MCU are not described in the present embodiment.
As shown in fig. 3, the method includes:
Step 101: and performing linear fitting on the scaling values of the gain factors corresponding to the maximum gain and the minimum gain in the preset gain range to obtain the gain factors corresponding to the gains in the preset gain range.
In which, as shown in fig. 4, step 1011: and respectively calibrating the gain factors of the maximum gain and the minimum gain to obtain calibrated values of the gain factors of the maximum gain and the minimum gain.
The method specifically comprises the following steps: obtaining the highest output light power corresponding to the preset gain range; determining an input optical power PH corresponding to the maximum gain according to the highest output optical power and the maximum gain; driving an amplifier with the input optical power PH, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibrated value of the gain factor of the maximum gain; determining the input optical power PL corresponding to the minimum gain according to the highest output optical power and the minimum gain; and driving an amplifier with the input optical power PL, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain so as to obtain the scaled value of the gain factor of the maximum gain.
In a preferred embodiment, for example, a preset gain range of 0-20dB, a maximum gain Gmax of 20dB, a minimum gain Gmin of 0dB is determined, the maximum output optical power pout_max of the amplifier is determined through an amplifier parameter table or actual measurement, then an input light source of the amplifier is connected to an amplifier input end, an optical power meter is connected to an amplifier output end, when the input light source optical power is adjusted and recorded so that the output optical power of the amplifier reaches pout_max, the input light source optical power value is set to PH, the amplifier is driven by the PH as the input optical power to adjust the internal gain regulator of the amplifier, the output optical power and the test gain value are observed, and when the test gain value reaches gmax=20 dB, the position of the gain regulator at the moment is recorded as a calibration gain factor gh_max; and (3) regulating the optical power of the input light source down to a minimum value PL capable of driving the amplifier to work, repeating the steps, and recording scaling gain factors Gl_min when the target test gain is Gmin=0 dB, namely, the Gh_max and Gl_min are the scaling values of the gain factors of the maximum gain and the gain factors of the minimum gain respectively.
Step 1012: and performing linear fitting on the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the gain factor corresponding to the maximum gain and the gain factor corresponding to the minimum gain to obtain a gain factor relation, so as to obtain the gain factors corresponding to the gains in the preset gain range according to the gain factor relation.
In a preferred embodiment, the scaling gain factor corresponding to the maximum gain and the scaling gain factor corresponding to the minimum gain are linearly fitted, and since the gain factor and the gain value are linearly related, the linear relation between the gain factor Gh and the gain value G can be obtained by using the linear fitting: gh=k1×g+b1, (k 1, b1 are constants, and represent multiplication), where k1 is a slope, b1 is an intercept, and values of k1 and b1 are calculated by substituting two points, that is, (maximum gain Gmax, gain factor gh_max) and (minimum gain Gmin, gain factor gl_min) into gh=k1×g+b1, and performing linear fitting, so that a relational expression between gain factor Gh and gain value G is obtained.
Furthermore, according to the preset gain range, the gain factors Gh corresponding to the gain values G in the gain range can be calculated.
Step 102: and performing linear fitting on the scaling values of the ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the ASE factors corresponding to the gains in the preset gain range.
In which, as shown in fig. 5, step 1021: and respectively calibrating the ASE factors with the maximum gain and the minimum gain to obtain calibration values of the ASE factors with the maximum gain and the minimum gain.
The method specifically comprises the following steps: acquiring the minimum output light power corresponding to the preset gain range; determining an input optical power PH' corresponding to the maximum gain according to the minimum output optical power and the maximum gain; driving an amplifier with the input optical power PH', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibration value of the ASE factor of the maximum gain; determining the input optical power PL' corresponding to the minimum gain according to the minimum output optical power and the minimum gain; and driving an amplifier with the input optical power PL', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain, so as to obtain the scaling value of the ASE factor of the maximum gain.
In a preferred embodiment, for example, a preset gain range is determined to be 0-20dB, a maximum gain is 20dB, a minimum gain is 0dB, a minimum output optical power pout_min of the amplifier is determined through an amplifier technical parameter or actual measurement, an input end of the amplifier is connected with a light source, an output end of the amplifier is connected with an optical power meter, the optical power of the input light source is adjusted, an input optical power value when the output optical power reaches pout_min is recorded, the value is set to be PH ', then the PH' is taken as an input, the amplifier is driven to work, an ASE regulator in the amplifier is adjusted, the output optical power and a test gain value are observed, and when the test gain value is 20dB, the position of the ASE regulator is recorded as an ASE calibration value of the maximum gain; and (3) reducing the power of the input light source by a bit again, setting the power to be PL', repeating the steps, and recording the ASE calibration value of the minimum gain when the test target gain is 0dB, and obtaining the ASE calibration values respectively corresponding to the maximum gain and the minimum gain in the mode.
Step 1022: and linearly fitting the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the ASE factor corresponding to the maximum gain and the ASE factor corresponding to the minimum gain to obtain an ASE factor relational expression, so as to obtain the ASE factors corresponding to the gains according to the ASE factor relational expression.
In a preferred embodiment, the scaling ASE factor corresponding to the maximum gain and the scaling ASE factor corresponding to the minimum gain are linearly fitted, and since the ASE factor and the gain value are linearly related, a linear relation between the ASE factor GA and the gain value G can be obtained by using the linear fitting: ga=k2×g+b2, (k 2, b2 are constants, and represent multiplication), where k2 is the slope and b2 is the intercept, and the values of k2 and b2 can be calculated by linear fitting at two points, i.e. the (maximum gain, ASE factor) and (minimum gain, ASE factor), so that a relation between the ASE factor GA and the gain value G is obtained, and the specific implementation steps are similar to the calibration process of the gain factor.
And further, according to a preset gain range, the ASE factor GA corresponding to each gain value G can be calculated.
Step 103: and in the preset gain range, scaling the input light to obtain the relation between the sampling ADC value of the input light corresponding to each gain in the preset gain range and the reporting power.
The method comprises the steps of presetting an input optical power range, dividing the input optical power range into a first optical power range and a second optical power range according to the optical power, wherein the first optical power range is higher optical power in the input optical power range, the second optical power range is lower optical power in the input optical power range, namely, the preset input optical power range takes a middle value, and the input optical power is greater than or equal to the middle value and belongs to the first optical power range, and the second optical power range is smaller than the middle value.
In a preferred embodiment, the reporting power covering the first optical power range and the second optical power range in the gain range includes:
case 1: under the maximum gain and higher optical power range, taking the maximum gain, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a first relation between reported power and sampling ADC value: reporting power=k1_h x+b1_h_, where X is the sampling ADC value and k1_h_and b1_h are constants.
Case 2: under the maximum gain and lower optical power range, taking the maximum gain, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a second relation between the reported power and the sampling ADC value: reporting power=k1_l x+b1_l, where X is the sampling ADC value and k1_l and b1_l are constants.
Case 3: taking the minimum gain under the range of the minimum gain and higher optical power, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a third relation between the reported power and the sampling ADC value: reporting power=k2_h x+b2_h_, where X is the sampling ADC value and k2_h_and b2_h are constants.
Case 4: taking the minimum gain under the range of the minimum gain and lower optical power, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a fourth relation between the reported power and the sampling ADC value: reporting power=k2_l x+b2_l, where X is the sampling ADC value and k2_l and b2_l are constants.
By the above four cases, in a preferred embodiment, a maximum gain value is set first, for example, 20dB, the input light PD is set to a first power gear (i.e., a higher gear), several input light power values are set according to a preset first light power range, for example, 10-20mW, and several values are set at intervals, for example, 11mW,16mW,19mW, etc., the several light power values are respectively led into an amplifier, sampling ADC values to which the input light PD is sampled are recorded, and milliwatt values of the several groups of input light power are respectively linearly fitted with the corresponding sampling ADC values, so as to obtain a first relationship; then the input light PD is switched to a second power gear (i.e. a lower gear) and the above steps are repeated according to a preset second optical power range, e.g. 0-10mW, resulting in a second relation.
Setting the gain to a minimum value, for example, 0dB, and repeating the above steps in the first power gear and the second power gear respectively to obtain a third relationship and a fourth relationship, where the specific process is not described in the embodiment.
Obtaining a relation between the sampling ADC value and the reported power according to the first relation, the second relation, the third relation and the fourth relation, and then performing linear fitting on K1_h and K2_h and the maximum gain and the minimum gain; linearly fitting K1_l and K2_l with the maximum gain and the minimum gain; linearly fitting B1_h and B2_h with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain; and linearly fitting B1_l and B2_l with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain.
The method comprises the following steps of: reporting power=k_h_factor+adc+b_h_factor, reporting power=k_l_factor+adc_l_factor, reporting power=k_h_offset+adc_h_offset, reporting power=k_l_offset+adc+b_l_offset, where k_h_factor, b_h_factor, k_l_factor, b_l_factor, k_h_offset, b_h_offset, k_l_offset, and b_l_offset are constants, so as to obtain a relationship between the sampled ADC value of the input light corresponding to each gain in the preset gain range and the reporting power.
The main process is as follows:
performing linear fitting on the K1_h and the K2_h with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking the K2_h as an ordinate as a first fitting point, taking the maximum gain as an abscissa, taking the K1_h as an ordinate as a second fitting point, and performing linear fitting on the first fitting point and the second fitting point to obtain a slope factor K_h_factor;
performing linear fitting on K1_l and K2_l with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking K2_l as an ordinate as a third fitting point, taking the maximum gain as an abscissa, taking K1_l as an ordinate as a fourth fitting point, and performing linear fitting on the third fitting point and the fourth fitting point to obtain a slope factor K_l_factor;
Linearly fitting B1_h and B2_h with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely linearly fitting the fifth fitting point and the sixth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_h as an ordinate as a fifth fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_h as an ordinate as a sixth fitting point, and obtaining an offset factor B_h_offset;
and linearly fitting the B1_l and the B2_l with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely linearly fitting the seventh fitting point and the eighth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_l as an ordinate as a seventh fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_l as an ordinate as an eighth fitting point, and obtaining an offset factor B_l_offset.
The following four formulas are obtained:
reporting power=k_h_factor adc+b_h_factor, applicable to the first optical power range; reporting power=k_l_factor adc+b_l_factor, applicable to the second optical power range; reporting power=k_h_offset adc+b_h_offset, applicable to the first optical power range; reporting power=k_l_offset adc+b_l_offset, applicable to the second optical power range. Through the four formulas and the automatic switching of the module gear, the corresponding reporting power can be calculated according to any gain value and an ADC sampling value, and the ADC sampling value and the target gain have the following linear relation: adc=f×i PD * Rg+q, (ADC stands for ADC sampling value, f and q stand for constant, I) PD The method is characterized in that a plurality of relations are integrated into four formulas to describe the mapping relation of the gain, the ADC sampling value and the reporting power, and the accurate calculation of the reporting power is realized.
Step 104: and determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power.
The amplifier also comprises a digital potentiometer; as shown in fig. 6, for any target gain in the preset gain range, the PID control circuit obtains a target gain factor, a target ASE factor and a target reporting power corresponding to the target gain respectively; controlling the resistance value of the digital potentiometer through the target gain factor; and adding the power of the target ASE factor and the target reporting power to obtain the target input optical power.
The amplifier system also comprises a digital potentiometer, the resistance of the digital potentiometer can be controlled by a digital signal, and for any target gain in a preset gain range, a PID control circuit can acquire: the target gain factor, the target ASE factor and the target reporting light power corresponding to the target gain are used for controlling the resistance value of the digital potentiometer through the target gain factor to realize the target gain, ASE light source power represented by the target ASE factor is added with the target reporting light power to be used as target input light power of the whole amplifier, the process is used for controlling the gain of the amplifier through the digital potentiometer to realize the target gain, and the actual target input light power under the influence of the ASE light source is calculated, so that the input light power of the amplifier can be accurately controlled through controlling the target gain under any target gain, and the combined control of the gain of the amplifier and the input light power is realized through the compensation of the digital potentiometer and the ASE light source in the whole process so as to achieve different target values.
Step 105: and obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
The amplifier further comprises a PID control circuit; taking the target input optical power as a first input of the PID control circuit; taking the output optical power as a second input of the PID control circuit; the PID control circuit obtains a control error signal according to the difference value of the first input and the second input; the control error signal is used as the input of the pumping DAC, the driving current of the pumping unit is controlled through the digital potentiometer to obtain the pumping DAC value required under the target gain, and the pumping unit is directly driven by the control error signal as the driving current to regulate the current so as to lock the target gain.
Referring to fig. 6, the PID control circuit takes the target input optical power as a first input and the measured output optical power as a second input, calculates a control error signal according to the difference between the two inputs, i.e., a control error, the control error signal is taken as an input of a pumping DAC, a driving current of a pumping unit is controlled by a digital potentiometer, a pumping DAC value required under the target gain is obtained, then the obtained pumping DAC value is directly driven by the pumping unit, the current of the pumping unit is regulated in real time, the output optical power and the target input optical power are subjected to negative feedback control by the PID control circuit, and the target gain is locked and maintained by the digital potentiometer and the pumping unit in a combined mode, so that the amplifier system can stably work at a preset target gain level under different conditions.
The invention obtains the gain factors, ASE factors and reported power corresponding to all gain points in a preset gain range by respectively carrying out linear fitting on the gain factors, ASE factors and the calibrated values of the reported power of the maximum gain point and the minimum gain point in the preset gain range in advance, obtains the target gain factors, the target ASE factors and the target reported power corresponding to the target gain after confirming the target gain, obtains the target input optical power according to the target gain factors, the target ASE factors and the target reported power, obtains the pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusts the driving current of a pumping unit through the pumping DAC value so as to realize the locking of the target gain; the accuracy of reporting power of the EDFA is improved on the basis of not improving development cost, and the gain of the EDFA is rapidly locked.
Example 2
In embodiment 1, a method for implementing fast locking of different gains of an EDFA is proposed, and in this embodiment, an apparatus for implementing fast locking of different gains of an EDFA is proposed, as shown in fig. 7, including: the device comprises a gain factor fitting module, an ASE factor fitting module, an input light scaling module, an obtaining module and a locking module.
The gain factor fitting module is used for linearly fitting the calibration values of the gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the gain factors corresponding to the gains in the preset gain range; the ASE factor fitting module is used for linearly fitting the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain ASE factors corresponding to the gains in the preset gain range; the input light scaling module is used for scaling input light in the preset gain range to obtain the relation between the sampling ADC value of the input light corresponding to each gain in the preset gain range and the reporting power; the acquisition module is used for determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power; the locking module is used for obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
Specific steps of the method for implementing fast locking of different gains of the EDFA refer to embodiment 1, and are not described in detail in this embodiment.
Example 3
The invention will be further illustrated in this embodiment by way of example with respect to a method of achieving fast locking of different gains of an EDFA. For example, the preset gain range is 10-20 dB, the input light range is-33-3 dBm, and the output light range is-13 dBm. The GAIN factor can be calibrated in advance according to the condition, namely when the output light is 13dBm, the target GAIN is 10dB, the input light is 3dBm, and the GAIN factor corresponding to 10dB is obtained;
the gain factors corresponding to the respective gains in the gain range, i.e. ASE factors, are first scaled (see example 1 for a specific implementation thereof).
And then calibrating the input light under different target gains to obtain the relation between the sampling ADC value and the reporting power of the input light corresponding to each gain in the preset gain range (the specific implementation method is shown in the embodiment 1).
According to the scaling result, for any target gain and input optical power, such as 15dB target gain and-5 dBm input optical power, the PID control circuit can directly obtain the gain factor, ASE factor and reporting power corresponding to 15 dB.
The ASE light source power expressed by a target ASE factor is added with the target reporting light power to be used as the target input light power of the whole amplifier, the PID control circuit takes the target input light power as a first input and takes the measured output light power as a second input, the PID control circuit calculates a control error signal according to the difference value between the two inputs, namely a control error, the control error signal is used as the input of a pumping DAC, the driving current of the pumping unit is controlled by a digital potentiometer to obtain a pumping DAC value required under the target gain, the obtained pumping DAC value is directly used for driving the pumping unit to adjust the current of the pumping unit in real time, and the output light power and the target input light power are subjected to negative feedback control by the PID control circuit and are jointly adjusted by the digital potentiometer and the pumping unit to realize locking and maintaining the target gain. The PID control principle is not described in the present embodiment.
Specific steps of the method for implementing fast locking of different gains of the EDFA refer to embodiment 1, and are not described in detail in this embodiment.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. A method for implementing fast locking of different gains of an EDFA, comprising:
performing linear fitting on the calibration values of the gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the gain factors corresponding to the gains in the preset gain range;
performing linear fitting on the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain ASE factors corresponding to the gains in the preset gain range;
in the preset gain range, scaling the input light to obtain the relation between the sampling ADC value and the reporting power of the input light corresponding to each gain in the preset gain range;
determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power;
and obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
2. The method for implementing fast locking of different gains of an EDFA according to claim 1, wherein the linearly fitting the scaled values of gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain gain factors corresponding to the gains in the preset gain range includes:
calibrating the gain factors of the maximum gain and the minimum gain respectively to obtain calibrated values of the gain factors of the maximum gain and the minimum gain;
and performing linear fitting on the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the gain factor corresponding to the maximum gain and the gain factor corresponding to the minimum gain to obtain a gain factor relation, so as to obtain the gain factors corresponding to the gains in the preset gain range according to the gain factor relation.
3. The method for implementing fast locking of different gains of an EDFA according to claim 2, wherein the scaling the gain factors of the maximum gain and the minimum gain to obtain the scaled values of the gain factors of the maximum gain and the minimum gain respectively includes:
obtaining the highest output light power corresponding to the preset gain range;
Determining an input optical power PH corresponding to the maximum gain according to the highest output optical power and the maximum gain;
driving an amplifier with the input optical power PH, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibrated value of the gain factor of the maximum gain;
determining the input optical power PL corresponding to the minimum gain according to the highest output optical power and the minimum gain;
and driving an amplifier with the input optical power PL, and adjusting the gain factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain so as to obtain the scaled value of the gain factor of the maximum gain.
4. The method for implementing fast locking of different gains of an EDFA according to claim 1, wherein the linearly fitting the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the ASE factors corresponding to the gains in the preset gain range includes:
calibrating ASE factors of the maximum gain and the minimum gain respectively to obtain calibration values of the ASE factors of the maximum gain and the minimum gain;
And linearly fitting the milliwatt value corresponding to the maximum gain, the milliwatt value corresponding to the minimum gain, the ASE factor corresponding to the maximum gain and the ASE factor corresponding to the minimum gain to obtain an ASE factor relational expression, so as to obtain the ASE factors corresponding to the gains according to the ASE factor relational expression.
5. The method of claim 4, wherein the scaling the ASE factors of the maximum gain and the minimum gain to obtain the scaled values of the ASE factors of the maximum gain and the minimum gain comprises:
acquiring the minimum output light power corresponding to the preset gain range;
determining an input optical power PH' corresponding to the maximum gain according to the minimum output optical power and the maximum gain;
driving an amplifier with the input optical power PH', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the maximum gain, so as to obtain the calibration value of the ASE factor of the maximum gain;
determining the input optical power PL' corresponding to the minimum gain according to the minimum output optical power and the minimum gain;
and driving an amplifier with the input optical power PL', and adjusting the ASE factor of the amplifier until the actual gain obtained by testing is equal to the minimum gain, so as to obtain the scaling value of the ASE factor of the maximum gain.
6. The method for implementing fast locking of different gains of an EDFA according to claim 1, wherein said scaling the input light in the preset gain range to obtain the relation between the sampled ADC value of the input light corresponding to each gain in the preset gain range and the reported power comprises:
presetting an input optical power range, and dividing the input optical power range into a first optical power range and a second optical power range according to the optical power;
taking the maximum gain, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a first relation between the reported power and the sampling ADC value: reporting power=k1_h x+b1_h_, wherein X is a sampling ADC value, k1_h_ and b1_h are constants;
taking the maximum gain, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a second relation between the reported power and the sampling ADC value: reporting power=k1_l x+b1_l, where X is the sampling ADC value and k1_l and b1_l are constants;
Taking the minimum gain, respectively setting input optical power according to the first optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a third relation between the reported power and the sampling ADC value: reporting power=k2_h x+b2_h_, wherein X is a sampling ADC value, k2_h_ and b2_h are constants;
taking the minimum gain, respectively setting input optical power according to the second optical power range, recording an ADC sampling value corresponding to each optical power, fitting the ADC sampling value with a milliwatt value corresponding to the actual input optical power of the amplifier, and obtaining a fourth relation between the reported power and the sampling ADC value: reporting power=k2_l x+b2_l, where X is the sampling ADC value and k2_l and b2_l are constants;
and obtaining the relation between the sampling ADC value and the reporting power according to the first relation, the second relation, the third relation and the fourth relation.
7. The method of claim 6, wherein the deriving the relationship between the sampled ADC value and the reported power according to the first relationship, the second relationship, the third relationship, and the fourth relationship comprises:
Performing linear fitting on the K1_h and the K2_h with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking the K2_h as an ordinate as a first fitting point, taking the maximum gain as an abscissa, taking the K1_h as an ordinate as a second fitting point, and performing linear fitting on the first fitting point and the second fitting point to obtain a slope factor K_h_factor;
performing linear fitting on K1_l and K2_l with the maximum gain and the minimum gain, namely taking the minimum gain as an abscissa, taking K2_l as an ordinate as a third fitting point, taking the maximum gain as an abscissa, taking K1_l as an ordinate as a fourth fitting point, and performing linear fitting on the third fitting point and the fourth fitting point to obtain a slope factor K_l_factor;
linearly fitting B1_h and B2_h with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely linearly fitting the fifth fitting point and the sixth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_h as an ordinate as a fifth fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_h as an ordinate as a sixth fitting point, and obtaining an offset factor B_h_offset;
Performing linear fitting on the B1_l and the B2_l with the milliwatt value corresponding to the maximum gain and the milliwatt value corresponding to the minimum gain, namely performing linear fitting on the seventh fitting point and the eighth fitting point by taking the milliwatt value corresponding to the minimum gain as an abscissa, taking the B2_l as an ordinate as a seventh fitting point, taking the milliwatt value corresponding to the maximum gain as an abscissa, taking the B1_l as an ordinate, and obtaining an offset factor B_l_offset;
the method comprises the following steps of: reporting power=k_h_factor+adc+b_h_factor, reporting power=k_l_factor+adc_l_factor, reporting power=k_h_offset+adc_h_offset, reporting power=k_l_offset+adc+b_l_offset, where k_h_factor, b_h_factor, k_l_factor, b_l_factor, k_h_offset, b_h_offset, k_l_offset, and b_l_offset are constants, so as to obtain a relationship between the sampled ADC value of the input light corresponding to each gain in the preset gain range and the reporting power.
8. A method of achieving fast locking of different gains of an EDFA according to claim 7, wherein the amplifier comprises a digital potentiometer and PID control circuit;
the determining the target gain to obtain a target gain factor, a target ASE factor and a target reporting power corresponding to the target gain, and obtaining the target input optical power according to the target gain factor, the target ASE factor and the target reporting power includes:
For any target gain in the preset gain range, the PID control circuit respectively acquires a target gain factor, a target ASE factor and target reporting power corresponding to the target gain;
controlling the resistance value of the digital potentiometer through the target gain factor;
and adding the power of the target ASE factor and the target reporting power to obtain the target input optical power.
9. The method for implementing fast locking of different gains of an EDFA according to claim 8, wherein the obtaining the pump DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pump unit by using the pump DAC value, so as to implement locking of the target gain specifically comprises:
taking the target input optical power as a first input of the PID control circuit;
taking the output optical power as a second input of the PID control circuit;
the PID control circuit obtains a control error signal according to the difference value of the first input and the second input;
the control error signal is used as the input of the pumping DAC, the driving current of the pumping unit is controlled through the digital potentiometer to obtain the pumping DAC value required under the target gain, and the pumping unit is directly driven by the control error signal as the driving current to regulate the current so as to lock the target gain.
10. An apparatus for implementing fast locking of different gains of an EDFA, the apparatus being configured to implement a method for implementing fast locking of different gains of an EDFA according to any of claims 1-9, comprising: the device comprises a gain factor fitting module, an ASE factor fitting module, an input light scaling module, an obtaining module and a locking module;
the gain factor fitting module is used for linearly fitting the calibration values of the gain factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain the gain factors corresponding to the gains in the preset gain range;
the ASE factor fitting module is used for linearly fitting the calibration values of ASE factors corresponding to the maximum gain and the minimum gain in a preset gain range to obtain ASE factors corresponding to the gains in the preset gain range;
the input light scaling module is used for scaling input light in the preset gain range to obtain the relation between the sampling ADC value of the input light corresponding to each gain in the preset gain range and the reporting power;
the acquisition module is used for determining a target gain, obtaining a target gain factor, a target ASE factor and target reporting power corresponding to the target gain, and obtaining target input optical power according to the target gain factor, the target ASE factor and the target reporting power;
The locking module is used for obtaining a pumping DAC value required by the target gain according to the monitored output optical power and the target input optical power, and adjusting the driving current of the pumping unit through the pumping DAC value so as to lock the target gain.
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